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  • Title: Protein structural domains in the Caenorhabditis elegans unc-54 myosin heavy chain gene are not separated by introns.
    Author: Karn J, Brenner S, Barnett L.
    Journal: Proc Natl Acad Sci U S A; 1983 Jul; 80(14):4253-7. PubMed ID: 6576334.
    Abstract:
    The 1,966-amino acid unc-54 myosin heavy chain sequence was determined from DNA sequence studies of the cloned gene. The gene is split by eight short introns, 48-561 base pairs long, and appears to lack a "TATA" box at its promoter. The physical map of the gene was aligned with the genetic map by locating two point mutations and three internal deletions: 0.01 map units correspond to approximately 5 kilobases. Comparison of the unc-54 protein sequence with the sequence of a second myosin heavy chain from nematode, indicates that the globular head sequence S-1 is more highly conserved than the alpha-helical coiled-coil rod. Major sites of proteolysis in S-1 are associated with variable sequences that have the characteristics of surface loops. In both genes there is no correlation between the positions of introns and the major protein structural domains.
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